I have a device that returns data as a Hex value, for example 00 00 00 56 00 00 01 00. I place this into an NSString. I am only interested in converting the 3rd and 4th segment to a double. ie only 00 56.
On sites such as http://www.binaryhexconverter.com/hex-to-decimal-converter it works and returns me the value I want.
When I try to use NSScanner it doesn't like that it is only a segment of a Hex code.
NSScanner *scanner = [[NSScanner alloc] initWithString:numberAsHex];
double value = 0.0;
BOOL result = [scanner scanHexDouble:&value];
NSLog(@"Value %@", [NSNumber numberWithDouble:value]);
NSLog(@"Result %c", result);
I have also tried to use strtol() as well but no luck.
Could anyone help?
That string for NSScanner should be like this. Here is a sample code (It works.)
NSScanner *scanner = [[NSScanner alloc] initWithString:@"0x0056"];
double value = 0;
BOOL result = [scanner scanHexDouble:&value];
NSLog(@"Value %@", [NSNumber numberWithDouble:value]);
NSLog(@"Result %c", result);